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The monthly mean outgoing long-wave radiation data from June 1974 to May 1981 were analysed for dominant eigenvector patterns. The first three eigenvector patterns explain nearly 93 per cent of the total variance. The first eigenvector pattern exhibits an annual cycle with a pronounced variation in the outgoing long-wave radiation over the tropical belt between lo" and 2WN. This is largely indicative of strong seasonal shift of the major area of cloudiness associated with the Intertropical Convergence Zone. The second eigenvector pattern shows an out-of-phase relationship between north India and the equatorial region, having a pronounced semi-annual oscillation. The third eigenvector pattern exhibits the characteristic features of the north-east monsoon over south-east peninsular India. The first and second harmonics, corresponding to annual and semi-annual oscillations, exhibit the major characteristic features of the first two eigenvectors, respectively.The interannual variation of the outgoing long-wave radiation for the summer monsoon period shows a close association with the large-scale monsoon rainfall over India.It is concluded that the satellite-derived outgoing long-wave radiation can be used to monitor more comprehensively the large-scale monsoon circulation and its year-to-year variability in view of its spatial coverage over oceanic areas.

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